LERP(9.1) LERP(9.1)
NAME
lerp, sub - linear combinations of images
SYNOPSIS
fb/lerp file fraction [ file fraction ... ]
fb/sub file1 file2
DESCRIPTION
Lerp computes a linear combination of a number of input
images. Each input file name is followed by a floating-
point fraction by which to scale its pixel values. The
fraction after the last image may be omitted, in which case
one minus the sum of the other fractions is used. The
resulting image is written to standard output.
Nothing prevents the fractions from being smaller than zero
or larger than one. Output pixel values that fall below
zero or above 255 are clamped.
Sub reads two images, which must be the same size and have
the same number of channels. Each channel of each pixel of
the output image is the absolute value of the difference
between the corresponding input values.
SOURCE
/sys/src/fb/lerp.c
/sys/src/fb/sub.c
SEE ALSO
picfile(9.6)
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